# phyiscs

A 14.5 kg toy car is driving around a horizontal circular track with a period of 8.0 seconds. The radius of the circular track is 1.1 meters. What is the force of friction in Newtons between the car and the track that is necessary for the car to remain on the track?
how do i do this(get started or equation)

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1. f = m v^2 / r

you have m and r , need to calculate v ... circumference / 8.0 s

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